I must say this current build of Halo 5 definitely emphasizes on team work. The Spartans are not so much the one man armies they use to be; where if you found yourself by yourself facing 3-4 enemy team members you could hold your own now you get sliced and are lucky to take one in the process (unless you have like power weapon then it seems lucky to get two on your way down.
Unfortunately I’ve been put in a ton of games where my team doesn’t realize it’s on a team and we get a bunch of lone wolf players getting cut down by the other team sticking together using there combined and overlapping firepower. 
Maybe eventually people will realize gone are the days of one man armies tanking into a group of eniems these new Spartans are made of glass.
The other thing I hope they are working on is some kind of idle player boot system… Can’t tell you how many countless games I’ve played where at least 1 team member just stand wherever they respawn. And I’m sure there will be some kind of penalty for quitting a game early because that is annoying as well.
and of course there is the ranking system that sucks that if your team looses but you still perform well they drag your skill down anyway… It is nice that once you reach a tier you don’t rank below it but I’ve gone from Silver 3 to the bottom of Silver 1. 